Magnetic Hard Drives

O A magnetic hard drive contains one or more round pieces of metal called hard disks or platters that are coated with a magnetisable substance. O These disks are permanently sealed inside the hard drive case. O Also it has read/ write heads used to write and read data and an access mechanism used to move the read/write heads. O Hard drives designed for desktop computers typically use 2.5-inch or 3.5-inch hard disks. O Notebook hard drives typically use 2.5-inch hard disks.